Elevator-control lock.



E. L.' DUNN.

ELEVATOR CONTROL LOCK.

Mmcmou man man zs. ma.

11,246,894i Pwnte. Nm" 20, mi?,

UivrrED STATES PATENT OFFICE.

EDWARD LEE DUNN, OF WORCESTER. MASSACHUSETTS, ASSIGNOR TO STANDARD PLUNGER ELEVATOR COMPANY, OF WORCESTER, MASSACHUSETTS, A CORPORA- TION 0F MASSACHUSETTS.

ELEVATOR-CONTROL LOCK.

Application led December To all whom it may concern.'

Be it known that I, EDWARD L. DUNN, a citizen of the United States, residing at Worcester, in the county of lVorcester and State of Massachusetts, have invented certain new and useful Improvements in Elevater-Control Locks, of which the following is a full, clear, and exact specification.

This invention relates to improvements in elevator control locks, and has particular reference to a locking device for elevators wherein the control of the power is effected through a hand rope or similar device. By this invention, the hand rope, rod or the like, is normally held locked against actuation to start the car, and can ouly be unlocked by a conscious effort on the part of the operator, or some other person before it can be moved sufliciently to apply the power to the hoisting motor. In addition, the normally operative lock is controlled by door switches either at the hatchway doors, or on the car, or both, so that the lock cannot be released, if any door is opened. The locking mechanism is so constructed that it does not interfere with movement of the controlling device to stop the elevator, but when the control device has been brought to the stop position, it is thereupon locked and cannot be released until the operator has made a special releasing movement distinct fromthat he uses in closing the door and starting the car. The lock itself is preferably constructed so that it moves to locking position by gravity and is held out of locking position b a solenoid, the device being also preferabgr attached to -the building near the hoisting motor, although itcould be carried on vthe car, in case the control rope extends up and down the hatchway and has a set of stop buttons for each floor.

In the accompanying drawings, Figure 1 .is a cross section of the locking device together with a section of a control rope, and

Fig. 2 is a diagram of the controlling circuits.

1 represents a controlling device for an elevator motor, as for example, a hand rope, which is provided with two buttons 2-34` beveled or rounded on oncside, and haing right angle surfaces on the other. The distance between these two buttons is less than the movement of the rope required to throw the power'controller ofthef elevator, such as Specification of Letters Patent.

29, 1915. Serial No. 69,192.

a valve or switch from stopped to running Patented Nov. 20, 1917.

position, it being understood that when the rope' 1s 1n a central position as shown in Fig. 1, the power. is cut off, and that itis moved up to start the motor in one direction I and down from this central position to start the motor in the other direction.l 4 represents a stationary double guide thimble preferably fixed to the building, through which the rope 1 passes. Mounted to slide transversely of thehole in the thimbleis a ring 5 having a central hole, which in one position of the slide registers with the hole in the thimble, so that the buttons 2, 3 can pass through withotutobstruction. This is the position shown in the figure in solid lines, when the control rope is unlocked and the elevator capable of being started in either direction. When the slide 5 is thrown to the right in Fig. 1, the passage through the thimble is obstructed so that the stop buttons 2 or 3 cannot pass vthe slide, thus locking the control rope. The slide 5 is actuated by a bell crank lever 6 pivoted at lever 6 pulls the slide 5 so as to obstruct' the passage through the thimble. When the solenoid 9 is energized, the core 8 is lifted and ythus the slide 5 moves to suchposition as to allow the buttons 2,3 to be moved freely through the thimble. The coil 9 is in series with door switches 10, 10, 10, and a car switch 11, so that when any door switch or car switch is open, the circuit of the coil 9 cannot be completed. The control is automatically locked, because it cannot be unlocked until the coil 9' can be energized. Push buttons 12 at the several floors may be provided to control the solenoid, and also push button 13 on the car. The push buttons 12 can be placed in the hatchway adjacent .each floor, so that the operator must not onlyclose the door but must in addition press the button 12 before he can unlock the control device `\t0 start the car.

K Obviously, the push buttons 12 can be located at any desirable place.

ion

have a pair ofA stop buttons for each floor. lVhen the rope is to he moved to stop the car7 it will be Seen that the rounded ends of the stop buttons move freely through the hole in the Slide 5,'hut the weight of the core 8 throws the slide hack after the button has passed so that the rope is locked against movement in either direction.

Various modifications and changes ma)v be made without departing from the scope of the appended claims.

What. I claim is d l. The combination with an elevator controlling means, of looking means normally effective to prevcntactuation ot said controlling' means to start the car in all positions of the elevator door, and manually controlled means dependent in its action upon a position oi said door for rendering; said locking] means inell'ective and perniitting starting` of the car, said manually controlled means heini;- accessible from within the ear when the elevator door is closed.

2. The, combination with an elevator controlling' means, of locking, means normally etl'eetive to prevent actuation ot said controlling` means to start the car in all positions of the elevator door, and manually controlled means'within the elevator hatchway eil'cetive only upon closing;` ol thc elevator door l'or rendering Said loeliiner means ineffective and permitting' starting ot the car.

3. The combination with an elevator controlling` means lor starting the car, of means 'for preventing` and permitting` movement of said controlling means'eomprising an electric circuit normali;7 open during the movement ot the car and when the elevator door is open, and a switch for closing' said oireuit and releasing said locking means to permit startingr of the car, said switch being dependent for its circuit closing' action upon the` position of said doo and having means normally holdin;` it. in open position.

4'. l`he combination with an elevator controlliir;` means, ol locking' means for preventing movement oi said controlling` means to start the car. and releasing means comprising an electric circuit normally open while the ear is in motion, a switch normally liiased to open position and placed within the elevator hatchwa)v l'or closing said circuit to permit starting olt the car. and means render-ingr said circuit closing' switch inell'ective until the elevator door is closed.

5. The combination with an elevator controlling; means,.ot` locking' means l'or preventing actuation ot said controllingl means to start the 'ar` and releasing means coinprising; an electric circuit havingr a manuallv controlled switch having' means norniall'v holding it in open position and henner elleetive when closed to rel ase said locking means and permit starting' of the car, and means Vlor rendering said switch inel'l'ective when the elevator door is open.

ln testimon)v whereoll l alix inlv signature, in presence ol two witnesses.

l `.l)\\".\l{l) lllll DUNN.

.'itnessesz l. lll, t lanma'r'r, lil. Il. KEMP. 

